Umbrella



FIG. 1 is a perspective view of the umbrella showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a front elevational view, shown in a closed position. 

The ornamental design of an umbrella, as shown and described. 